Improvement in dividers



G. C. MILLER.

Dividers.

, NO IAQO'BZI i Pa'tentedMarch3hl8-74.

UNITED STATES PATENT OEEICE.

GEORGE O. MILLER, OF DETROIT, MICHIGAN, ASSIGNOR TO JAMES O. MALOY,

' OF OIL CITY, PENNSYLVANIA.

IMPROVEMENT IN DIVIDERS.

Specification forming part of Letters Patent No. 149,052, dated March 3l, 1874; application filed December 2:2, 1873.

To all whom #may concern:

Beit known that I, GEORGE C'. MILLER, of Detroit, in the county of Vayne and State of Michigan, have invented an Improvement in Dividers, of which the following is a specification:

The nature of this invention relates to new and useful improvements iu the construction of dividers 5 and consists in the novel construction and arrangement of the devices for holding the legs in the desired position, as more fully hereinafter explained.

Figure 1 is a perspective view of my improved extension-dividers with the points in place. Fig. 2 is a section of one of the legs. Fig. 3 is a perspective of the holding-ring. Fig. Liis a sectional view, showing the engagement of the thumb-cam with the arch.

Like letters refer to like parts in each iigure.

In the annexed drawings, A represents the legs of the dividers, hinged together at a in the usualmanner. One or both of these legs thereof, sliding up the face of the inclined plane, compresses the tubular end, and holds firmly the extension pointV or pencil in place.

-D is the arch, secured by the usual thumbscrew E to one of the legs, and passing through a proper opening in the opposite leg. The position of the legs, when distended, is governed by the thumb-cam el, which is inserted through the leg in such a manner that when turned in the proper direction the face of the cam will press against and bind the arch. This arch is usually made of a thin and dat piece of iron or steel, the edge of which is too thin to form a reliablebearing-surface for the cam, although it may be used in connection with the flat arch. I prefen said arch to be made of a round metal rod, bent to proper shape. Then the bearin glface of the cam cl should be made concave to obtain a greater bearing-surface on the con vex face of the arch.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. In combination with the leg A, the thumbcam d and arch D,substantially as and for the purposes specied.

2. In combination with said thumb-cam d, the round arch D, as and for the purposes described.

GEO. O. MILLER. 

